JP2001117075A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easier to replace back-light, and to improve reliability, while making a liquid crystal display device low-profile. SOLUTION: This liquid crystal display device comprises a liquid crystal display element 3 having a pair of opposing transparent substrates 31, 32 holding a liquid crystal layer in-between, back-light 61 arranged on the back face of this liquid crystal display element 3, a driving circuit substrate 4 for driving the liquid crystal display element 3, an outer case 2 provided with an opening part 21 for housing these liquid crystal display element 3, back-light 61, and driving circuit substrate 4 and exposing a display area of the liquid crystal display element 3, and the transparent 31 on the front face side of the pair of transparent substrates 31, 32, is inserted into the opening part 21 of the outer case 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly to a technique suitable for use in a liquid crystal display having a backlight.

[0002]

2. Description of the Related Art In recent years, small and portable liquid crystal display devices such as mobile tools, small portable televisions, portable game machines, and the like have been increasingly used. Since such a liquid crystal display device is used in a state of being carried and used, there is a great demand for downsizing in order to improve its convenience.
In order to reduce the size of the liquid crystal display device, particularly, there has been a demand to reduce the thickness.

As an example of such a liquid crystal display device, for example, a liquid crystal display device as shown in FIG. 6 is known. 6, reference numeral 10 denotes a liquid crystal panel, 12 denotes a driving IC,
13 is a flexible substrate, 20 is a light guide member, 30 is a frame, 31 is a fluorescent tube housing, 32 is a fluorescent tube reflection member receiving portion,
33 panel receiving part, 34 is a light guide member parting part, 35 is a hook, 36 is a panel storage part, 40 is a light diffusing member, 45 is a prism sheet, 50 is a backlight, 60 is a reflecting member,
61 and 62 are both ends, 70 is a panel front support member, 71
Denotes a liquid crystal panel display unit, and 100 denotes a source substrate.

In such a liquid crystal display device, the liquid crystal panel 10 has a liquid crystal sandwiched between two transparent substrates, and the periphery of the transparent substrate is sealed with a seal. On the opposing surface of the transparent substrate, a gate line and a source line are provided so as to be orthogonal to each other, and a flexible substrate (FPC) 13 is provided on the gate line and the source line.
Are connected to drive circuits on a gate substrate and a source substrate 100 on which a drive IC 12 for driving the liquid crystal panel 10 is provided, respectively. In addition, the liquid crystal display device is provided with a backlight 50 that illuminates the liquid crystal panel 10 from the side opposite to the viewing side (back side).

[0005]

In such a liquid crystal display device, as shown in FIG. 6, when viewed from the viewing side of the liquid crystal panel 10, the liquid crystal display device is located in front of the front surface of the liquid crystal panel 10, that is, outside the liquid crystal display device. , The panel front support member 70 is located. For this reason, in such a configuration, even if an attempt is made to further reduce the thickness, the panel front support member 70 cannot be positioned further inside the liquid crystal panel 10, so that further reduction in thickness is not possible. There was a problem.

Further, the drive IC 12 and the flexible substrate 13 are configured to be able to directly contact the panel front support member 70. In order to reduce the thickness, the internal space of the liquid crystal display device is reduced. Due to the decrease in natural convection in this internal space, the thermal conductivity decreases, the heat generated inside may be trapped inside the liquid crystal display device, causing a rise in temperature, which may cause malfunction of the device. Could be.

When the thickness is reduced by such a structure, the gate lines, the source lines, the flexible substrate, and the like on the liquid crystal panel may be separated from other adjacent components such as a panel front support member during assembly. The possibility of damaging internal parts during assembly increases due to thinning due to contact with
As a result, there is a problem that operation reliability may be reduced.

On the other hand, the life of the backlight is about half as short as the life of the liquid crystal panel. Therefore, there has been a demand that only the backlight be replaced and used. The display device had to be disassembled, which was inconvenient and demanded to be improved.

Further, in addition to a backlight (illumination device), there is a transformer such as a power supply transformer which is adversely affected by its thermal influence and noise due to radiated electromagnetic waves when it comes close to the drive IC. This was causing difficulties. In addition to the above, there has been a demand to maintain or improve the repairability and reliability and to reduce the thickness.

The present invention has been made in view of the above circumstances, and aims to achieve the following objects. To reduce the thickness of the liquid crystal display device. The backlight can be easily replaced. Improve reliability.

[0011]

The present invention provides a liquid crystal display device comprising a pair of transparent substrates opposed to each other with a liquid crystal layer interposed therebetween,
A backlight arranged on the back side of the liquid crystal display element,
A drive circuit board for driving the liquid crystal display element, and an outer housing in which the liquid crystal display element, the backlight and the drive circuit board are housed, and which has an opening for exposing a display area of the liquid crystal display element to the outside. The above object is achieved by inserting the transparent substrate on the front side of the pair of transparent substrates into the opening of the outer housing. Thereby, the vicinity of the opening of the outer casing and the transparent substrate on the front side of the liquid crystal display element can be positioned at substantially the same position in the thickness direction of the liquid crystal display device. Thereby, the dimension in the thickness direction of the liquid crystal display device can be reduced by at least a dimension corresponding to the thickness of the front transparent substrate of the pair of transparent substrates, and the thickness can be reduced. This is because, in the thickness direction of the liquid crystal display device, the front transparent substrate that has been located between the outer housing and the rear transparent substrate of the pair of transparent substrates in the thickness direction of the liquid crystal display device has an opening in the outer housing. This is because the distance between the outer housing and the transparent substrate on the back side can be reduced by being located inside the unit.

In the present invention, a frame portion for accommodating the backlight is provided, and a terminal portion of the transparent substrate on the back side of the pair of transparent substrates of the liquid crystal display element is connected to the outer casing and the frame portion. It is desirable to be fixed while sandwiched between them. Thereby, in the thickness direction of the liquid crystal display device, the outer case, the front transparent substrate is not located between the rear transparent substrate of the pair of transparent substrates,
In a state where the distance between the outer housing and the transparent substrate on the back side is reduced, the liquid crystal display element, the outer housing, and the frame can be fixed. Further, in the present invention, means for screwing the frame portion and the outer housing may be employed. Thereby, the disassembly and assembly simplicity can be improved.

According to the present invention, there is provided a liquid crystal display device having a pair of transparent substrates opposed to each other with a liquid crystal layer interposed therebetween, a backlight disposed on the back side of the liquid crystal display device, and a frame for accommodating the backlight. A drive circuit board for driving the liquid crystal display element, and an outer portion in which the liquid crystal display element, the backlight, and the drive circuit board are housed and an opening for exposing a display area of the liquid crystal display element to the outside is provided. A side opening that allows the backlight to be inserted into and removed from the frame portion, and that the backlight is insertable into and removable from the frame portion. The above-mentioned problem was solved by providing. As a result, the life of the backlight, which is about half as long as the life of the liquid crystal display element, expires, and when it becomes necessary to replace this backlight, only the backlight is opened on the side without disassembling the entire liquid crystal display device. It can be inserted and removed from the part, exchanged and used, and the convenience can be improved.

According to the present invention, a backlight case for housing the backlight is provided, and the backlight case is made of metal and can be housed in contact with the frame portion. The backlight is covered by the backlight case, which can improve the shielding state of electromagnetic waves and the like generated from the backlight, and also generates heat from the backlight similarly to the backlight case, the frame portion, and the frame. The liquid can be easily discharged to the outside of the liquid crystal display device via a plurality of members that are in contact with each other, such as an outer housing to which the units are connected. As a result, even when the space between the backlight and the driving IC or the like is reduced to reduce the thickness and the heat convection in the internal space is reduced,
It is possible to sufficiently release heat to the outside, and it is possible to prevent the drive IC and the like from malfunctioning. By inserting and removing the backlight case from the frame,
The backlight, that is, the backlight portion composed of a cold cathode tube, a light guide plate, and a plurality of members such as a reflection member, can be integrally mounted and pulled out. Thereby, convenience in assembling, adjusting, and replacing the backlight can be further improved. Further, the mechanical strength of the backlight can be improved by the backlight case. In particular, when inserting and removing the backlight, an operator who performs replacement work or the like can easily insert and remove the backlight case while holding the backlight case by hand. As a result, it is possible to reduce mechanical stress on other components of the liquid crystal display device in assembling, adjusting, and replacing the backlight.

In the present invention, means may be employed in which the backlight case and the frame portion are provided with a position defining portion for defining a mounting position between the backlight case and the frame portion. This makes it possible to easily regulate the position of the backlight case when it is fixed, to improve repairability, and to further improve convenience in assembling, adjusting, and replacing the backlight.

Further, a terminal portion of the liquid crystal display element and a drive circuit on the drive circuit board are connected by a flexible wiring board, and the flexible wiring board has a flexible circuit board on an outer housing side. It is preferable that a protection member for protecting the conductive wiring board is provided, and the protection member is made of a film, one end of the film is fixed to the drive circuit board, and the other end is fixed to the outer casing. be able to. This makes it possible to protect the transparent wiring made of ITO or the like provided on the terminal portion facing the outer housing and the flexible wiring board connected thereto. For example, when burrs are formed on a sheet metal such as an outer housing, it is possible to prevent the ITO and the flexible wiring board from being damaged and damaged, and from being disconnected. Also, there is no need to directly bond the protective member made of a film and the flexible wiring board. For this reason, when the protective film and the flexible wiring board are directly bonded, a mechanical stress is generated due to a difference in thermal expansion and contraction between the protective film and the adhesive, so that the terminal wiring and the flexible wiring board are not bonded to each other. Problems such as disconnection may occur at the connection part.
Such a problem can be prevented from occurring. In particular, when thinned, a heat source such as a backlight and a driving IC
And the amount of heat transmitted from the heat source to the driving IC and the like tends to increase, so that the above-mentioned problem is highly likely to occur, and this can be effectively avoided, and the liquid crystal display device Reliability can be improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a liquid crystal display device according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a liquid crystal display device of the present embodiment, and FIG. 2 is an exploded perspective view of the same. In the figure, reference numeral 1 denotes a liquid crystal display device, 2 denotes an upper case (outer housing), 3 denotes a liquid crystal panel (liquid crystal display element),
4 is a flexible wiring board (drive circuit board), 5 is a frame part, 6 is a backlight case, 7 is a control board, 8A is a power supply board, 8B is a decoder board, and 9 is a lower case (outer casing).

As shown in FIGS. 1 and 2, a liquid crystal display device 1 according to the present embodiment includes a liquid crystal display device 3 having a pair of transparent substrates 31 and 32 opposed to each other with a liquid crystal layer interposed therebetween. 3, a backlight unit 6, a frame unit 5 for accommodating the backlight 6, a driving circuit board 4 for driving the liquid crystal display element 3, and a liquid crystal display element 3, a backlight 6 And drive circuit board 4
Are stored in the outer casings 2 and 9. Outer housing 2,
9 is a side opposite to the upper case 2 on the viewing side (front side) (back side).
The upper case 2 is provided with an opening 21 for exposing the display area of the liquid crystal display element 3 to the outside. In the assembled state, the upper case 2 and the lower case 9 are each provided with a notch for forming a side surface opening K in a side surface portion, as described later.

The liquid crystal panel 3 includes two transparent substrates 31 and 3
2 and the transparent substrates 31 and 32
The periphery is sealed with a seal, and a gate line and a source line made of ITO or the like are provided on the opposing surfaces of the transparent substrates 31 and 32 so as to be orthogonal to each other. Are connected to a gate substrate 41 on which a drive IC for driving the liquid crystal panel 3 is disposed and source substrates 42, 42 via flexible wiring substrates (TCP: Taping Carrier Package) 33, 33, respectively.

FIGS. 3A and 3B are cross-sectional views of a main part of the liquid crystal display device 1 according to the present embodiment, FIGS. 4A and 4B are diagrams showing a liquid crystal panel, a frame portion, and the like, FIG. 3A is a plan view, FIG.
(C) is a partially cutaway front view. LCD panel 3
In, polarizing plates 31a and 32a are provided on the surfaces of a pair of transparent substrates 31 and 32, respectively. Of the pair of transparent substrates 31 and 32, the transparent substrate 31 on the viewing side (the front side or the outside of the liquid crystal display device 1) is, as shown in FIGS. 3 and 4, the rear side (or the inside of the liquid crystal display device 1). The contour shape on the display surface is smaller than that of the transparent substrate 32 of ()). That is, as shown in FIGS. 3 and 4, the transparent substrate 32 on the rear side has a portion which does not overlap with the transparent substrate 31 on the front side in plan view. The existing portion forms the terminal portion 32b. Further, a transparent substrate 31 on the front side is inserted into the opening 21 of the outer casing.

Gate substrate 41 and source substrates 42, 4
As shown in FIG. 4 (a), the transparent substrate 32 on the rear side has terminal portions 32 via flexible wiring substrates 33, 33.
b, and as shown in FIG.
2 and the transparent substrate 32 are positioned substantially parallel to each other at the time of assembling, and a part of the frame portion 5 and the backlight case 6 is interposed therebetween. The flexible wiring boards 33, 33 are assembled in a curved state as shown in FIG. Here, this flexible wiring board 3
A protective member (protective film) 4 made of a film is provided on the outside (upper case 2 side) of
3 are provided.

As shown in FIG. 3, both ends of the protective film 43 are fixed to the source substrate 42 and the upper case (outer housing) 2. This will be described in detail. In the protective film 43, the end portion on the terminal portion 32b side is positioned so as to cover the flexible wiring substrate 33 and the exposed terminal portion 32b of ITO, and The inner surface of the upper case 2 facing the exposed terminal portion 32b of the ITO is connected by a double-sided adhesive tape 44. In the protective film 43, the end on the source substrate 42 side is positioned so as to cover the flexible wiring substrate 33, and is connected to the surface of the source substrate 42 by a double-sided adhesive tape 45 at a position separated from the flexible wiring substrate 33. Have been. here,
The protection film 43 is fixed so that the protection film 43 and the flexible wiring board 33 are not directly bonded.

FIG. 5 is a sectional view showing a liquid crystal display device according to the present embodiment. The frame part 5 is shown in FIGS.
As shown in FIG. 7, the backlight case 6 is provided so as to be removably housed, and is connected to the upper case 2 and the lower case 9 so as to conduct heat and electric charges. In the thickness direction of the liquid crystal display device 1, a terminal portion 32b of the rear transparent substrate 32 of the pair of transparent substrates 31, 32 is sandwiched between the frame portion 5 and the upper case 2. In addition, at a position where the terminal portion 32b is not sandwiched, the frame portion 5 and the upper case 2 are fixed to each other at the joint portion S by a screw which is screwed, as shown in FIGS.

As shown in FIG. 4, on the upper surface of the frame portion 5, there are provided position setting portions 51 and 52 for setting a fixed position of the liquid crystal panel 3, and the position setting portion 51 is moved toward the source substrate 42 side. Frame part 5 so as to regulate the fixing position of
The position setting part 52 is provided so as to protrude from the main surface of the frame part 5 so as to regulate the position in the direction of the gate substrate 41 side. It has an embossed part. The fixing positions of the liquid crystal panel 3 with respect to the frame portion 5 are defined by the position setting portions 51 and 52, and the fixing positions of the liquid crystal panel 3 with respect to the outer casings 2 and 9 screwed to the frame portion 5. At the time of assembly, the transparent substrate 31 on the front side
Can be easily inserted into the opening 21 of the upper case 2.

The lower part of the frame part 5 is shown in FIGS.
As shown in the figure, position defining portions 53, 54, which define attachment positions of the backlight case 6 and the frame portion 5,
55 are provided. The position defining portions 53, 54, and 55 define a rail portion 53 that defines an insertion / removal position of the backlight case 6 that coincides with the longitudinal direction of the backlight case 6, and an installation position with respect to the liquid crystal panel 3 during the insertion / removal. It is formed of a lower rail portion 54 that regulates and a stopper portion 55 that regulates an end position in the insertion / removal direction of the backlight case 6.

As shown in FIG. 3, the backlight case 6 includes a backlight 61 such as a cold cathode tube, a light guide plate 62 for guiding the light from the backlight 61 to the liquid crystal panel 3, and a light guide plate 62. Sheets 63, 63 which are attached to the upper surface and are formed of a light diffusion member, a viewing angle correction member, and the like are stored.
Here, the backlight 61 has a structure in which the portion other than the side in contact with the light guide plate 62 is substantially covered with the backlight case 6. The backlight case 6 is made of, for example, SUS (stainless steel), has sufficient mechanical strength to withstand insertion and removal and deformation, and has excellent heat conductivity and electric conductivity. The generated heat and electric charges are conducted to the frame portion 5 and the like, and the heat and electromagnetic waves generated from the backlight 61 and the like are shielded, so that the influence on the external driving IC and the like is reduced.

The control board 7 includes a control IC 7
1, 71 and a switch unit 72 for inputting to the liquid crystal display device 1 are provided, and are connected to the gate substrate 41 and the source substrate 42. By controlling these operations, the display operation of the liquid crystal panel 3 is controlled. In addition, the operation of the liquid crystal display device 1 is controlled together with the decoder substrate 8B.

The power supply board 8A supplies necessary power to each part of the liquid crystal display device 1, and is provided with a power supply transformer 81 having a large height (thickness of the liquid crystal display 1). The power transformer 81 is provided at a position substantially overlapping the gate substrate 41 in plan view.

The lower case 9 is composed of the upper case 2 and the frame 5
And a connector portion 91 connected to the control board 7. Further, the side opening K is closed by the lid 22.

In the liquid crystal display device 1 of the present embodiment,
Power is supplied from the power supply substrate 7, and the liquid crystal display element 3 is driven by the gate substrate 41 and the source substrate 42 controlled by the control substrate 7, and the liquid crystal display element 3 is driven by the light of the backlight 61 guided through the light guide plate 62. indicate.

Here, the liquid crystal display device 1 of the present embodiment is
Since the front transparent substrate 31 is inserted into the opening 21 of the upper case (outer housing) 2, the vicinity of the opening 21 and the transparent substrate 31 on the front side of the liquid crystal display element 3 are separated from each other. 3 in the thickness direction. Accordingly, it is not necessary to include the thickness dimension of the upper case 2 outside the thickness dimension of the liquid crystal panel 3 as the thickness dimension of the liquid crystal display device 1. The size can be reduced by a size corresponding to the thickness of the transparent substrate 31. Therefore, the thickness of the liquid crystal display device 1 can be reduced. This is because the front transparent substrate 31 is not located between the upper case 2 and the rear transparent substrate 32 in the thickness direction of the liquid crystal display device 1, and is located in the opening 21 of the upper case 2. By doing so, the distance between the outer case 2 and the transparent substrate 32 on the back side can be reduced.

In this embodiment, the position setting section 51 and the position setting section 52 define the fixed position of the liquid crystal panel 3 with respect to the frame section 5, and
The terminal portion 32b of the transparent substrate 32 on the back side of the upper case 2
The liquid crystal panel 3 is fixed by being sandwiched between the upper case 2 and the frame portion 5 and screwing the upper case 2 and the frame portion 5 at the joint S. Thereby, the liquid crystal display device 1
The upper case 2 and the transparent substrate 3 on the back side
2, the front transparent substrate 31 is not positioned, and is located in the opening 21 of the upper case 2, that is, the liquid crystal display device 1 of the upper case 2 and the rear transparent substrate 32 The liquid crystal panel 3, the upper case 2, and the frame 5 can be fixed by reducing the interval in the thickness direction. Further, since the frame portion 5 and the upper case 2 are screwed together at the joining portion S, the disassembly / assembling convenience can be improved.

In the present embodiment, the backlight 61 is SU
The backlight case 6 is housed in a backlight case 6 made of S. The backlight case 6 can be inserted into and removed from the frame portion 5 and can be housed in a state of contact with the frame portion 5. Further, the backlight case 6 can be inserted into and removed from the frame unit 5, that is, the liquid crystal display device 1, from the side opening K of the outer casings 2 and 9.

By inserting and removing the backlight case 6 from the frame portion 5, the backlight portion, that is, the backlight portion composed of a cold cathode tube 61 and a plurality of members such as a light guide plate 62, sheets 63 and 63 is integrated. It can be attached and pulled out as Thereby, convenience in assembling, adjusting, and replacing the backlight portion can be further improved. Further, the backlight case 6 can improve the mechanical strength of the backlight portion.
In particular, when inserting and removing the backlight portion, the worker who performs the work can easily insert and remove the backlight case 6 while holding the backlight case 6 by hand. As a result, it is possible to reduce mechanical stress on other components of the liquid crystal display device 1 in assembling, adjusting, and replacing the backlight portion, for example, on the liquid crystal panel 3 that is vulnerable to mechanical stress.

As a result, the life of the backlight 61, which is shorter than the life of the liquid crystal panel 3 by about half, is expired, and when the backlight 61 needs to be replaced, the backlight 61 can be replaced without disassembling the entire liquid crystal display device. The light case 6 can be detached and only the backlight 61 can be replaced and used, so that the convenience can be improved. At the same time, since the backlight 61 is covered by the backlight case 6, electromagnetic waves and the like generated from the backlight 61 and the like are shielded, and the influence on the driving IC and the like can be reduced. Similarly, through a plurality of mutually contacting members such as a backlight case 6, a frame portion 5, and outer casings 2, 9 to which the frame portion 5 is connected,
The heat generated from the backlight 61 can be easily discharged to the outside of the liquid crystal display device 1. As a result, even if the distance between the backlight 61 and the driving ICs on the gate substrate 41 and the source substrate 42 is reduced to reduce the thickness of the liquid crystal display device 1, malfunction of the driving ICs and the like is prevented. It is possible to do.

In the present embodiment, the frame 5
On the lower side, position defining portions 53, 54, 55 for defining the mounting position of the backlight case 6 and the frame portion 5 are provided.
Is provided. Of the position defining sections 53, 54, 55,
The rail portion 53 defines the insertion / removal position of the backlight case 6, which coincides with the longitudinal direction of the backlight case 6, and the lower rail portion 54 determines the installation position of the backlight case 6 with respect to the liquid crystal panel 3 during insertion / removal. The end position of the backlight case 6 in the insertion / removal direction can be regulated by the stopper portion 55. This allows
It is possible to easily regulate the position of the backlight case 6 when the backlight case 6 is fixed to the frame portion 5, to improve repairability, and to assemble, adjust, and adjust the backlight portion.
The convenience in the exchange can be further improved.

In this embodiment, the flexible wiring board 3 connects the terminal portions 32b of the liquid crystal panel 3 to the driving circuits on the gate substrate 41 and the source substrate 42.
3 and 33 are protected by a protective film 43 provided on the outer casings 2 and 9 sides of the flexible wiring boards 33 and 33 so as to cover the flexible wiring board 33, and burrs are formed on the sheet metal such as the upper case 2. If this occurs, it is possible to prevent the flexible wiring board 33 from being damaged and damaged during assembly. The protective film 43 is connected to the terminal 32.
b, it protects the transparent wiring made of ITO of the terminal portion 32b, and if the metal plate of the upper case 2 or the like has burrs, it damages the ITO of the terminal portion 32b during assembly. Thus, breakage such as disconnection can be prevented.

One end of the protective film 43 is fixed to the source substrate 42 and the other end is fixed to the upper case 2 so that the protective film 43 does not directly bond the protective film 43 and the flexible wiring board 33. Therefore, when the protective film 43 and the flexible wiring board 33 are directly bonded to each other, mechanical stress occurs due to thermal expansion and contraction between the protective film and the adhesive, and the connection between the terminal portion wiring and the flexible wiring board is caused. Inconveniences such as disconnection at a portion can be avoided. Thereby, the reliability of the liquid crystal display device 1 can be improved. In particular, the liquid crystal display device 1
Is thinned, the heat source such as the backlight 61 and the driving I
Since the distance to C or the like is shortened and the amount of heat transmitted from the heat source to the driving IC or the like tends to increase, the above-described problem is highly likely to occur, and this can be effectively avoided.
The reliability of the liquid crystal display device 1 can be further improved.

Further, the power transformer 81 having a large height dimension (thickness dimension of the liquid crystal display device 1) is placed at a position different from the backlight case 6 in plan view, that is, at a position substantially overlapping the gate substrate 41 in plan view. By providing this, it is not necessary to include the power transformer 81 and the backlight case 6 as the thickness dimension of the liquid crystal display device 1, so that it is possible to further reduce the thickness.

[0040]

According to the liquid crystal display device of the present invention, the transparent substrate on the front side of the pair of transparent substrates is inserted into the opening of the outer casing to reduce the thickness, and the backlight case is formed. With the provision, the backlight can be easily replaced, and the protection member can improve reliability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is an exploded perspective view showing one embodiment of the liquid crystal display device according to the present invention.

FIG. 3 is a cross-sectional view of a principal part showing one embodiment of a liquid crystal display device according to the present invention.

FIGS. 4A and 4B are diagrams showing a configuration of a liquid crystal panel and a frame portion, etc., wherein FIG. 4A is a plan view, FIG. 4B is a side view, and FIG.
Is a partially cutaway front view.

FIG. 5 is a cross-sectional view of a principal part showing one embodiment of a liquid crystal display device according to the present invention.

FIG. 6 is a cross-sectional view illustrating an example of a conventional liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Upper case (outer housing), 3 ... Liquid crystal panel (liquid crystal display element), 4 ... Drive circuit board, 5 ... Frame part, 6 ... Backlight case, 7 ... Control board, 8A ... Power supply board, 8B: decoder board, 9: lower case (outer housing), 21: opening, 31, 32: transparent board,
32b: terminal portion, 61: backlight, K: side opening, S: joint

Claims (8)

[Claims] 1. A liquid crystal display device comprising a pair of transparent substrates opposed to each other with a liquid crystal layer interposed therebetween, a backlight disposed on the back side of the liquid crystal display device, and a driving circuit for driving the liquid crystal display device A substrate, and an outer housing in which the liquid crystal display element, the backlight, and the drive circuit board are housed, and which has an opening for exposing a display area of the liquid crystal display element to the outside; Wherein the front transparent substrate is inserted into the opening of the outer casing. 2. A frame portion for accommodating the backlight is provided, and a terminal portion of a transparent substrate on a back side of the pair of transparent substrates of the liquid crystal display element is disposed between the outer housing and the frame portion. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is fixed while being sandwiched between the liquid crystal display devices. 3. The liquid crystal display device according to claim 2, wherein the frame portion and the outer housing are screwed. 4. A liquid crystal display device comprising a pair of transparent substrates opposed to each other with a liquid crystal layer interposed therebetween, a backlight disposed on the back side of the liquid crystal display device, a frame for accommodating the backlight, A drive circuit board for driving the liquid crystal display element, and an outer housing in which the liquid crystal display element, the backlight, and the drive circuit board are housed and an opening for exposing a display area of the liquid crystal display element to the outside is provided. The backlight is configured to be insertable into and removable from the frame portion, and the outer housing is provided with a side opening that allows the backlight to be inserted into and removed from the frame portion. A liquid crystal display device characterized in that: 5. The backlight case according to claim 4, wherein a backlight case for storing the backlight is provided, and the backlight case is made of metal, and is stored in contact with the frame portion. Liquid crystal display. 6. The liquid crystal display device according to claim 5, wherein the backlight case and the frame portion are provided with a position defining portion for defining a mounting position between the backlight case and the frame portion. . 7. A flexible wiring board connects a terminal portion of the liquid crystal display element and a driving circuit on the driving circuit board, and the flexible wiring board has an outer housing side, 5. The liquid crystal display device according to claim 1, further comprising a protection member for protecting the conductive wiring board. 8. The device according to claim 7, wherein the protection member is made of a film, one end of the film is fixed to the drive circuit board, and the other end is fixed to the outer casing.
The liquid crystal display device as described in the above.